<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <el-form :model="loginForm" :rules="loginFormRules" ref="loginFormRef" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user">
          </el-input>
        </el-form-item>
        <!-- 登录密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-3702mima">
          </el-input>
        </el-form-item>
        <!-- 两个按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="reset">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        loginFormRules: {
          username: [{
              required: true,
              message: '请输入用户名',
              trigger: 'blur'
            },
            {
              min: 3,
              max: 10,
              message: '长度在 3 到 10 个字符',
              trigger: 'blur'
            }
          ],
          password: [{
              required: true,
              message: '请输入登录密码',
              trigger: 'blur'
            },
            {
              min: 6,
              max: 10,
              message: '长度在 6 到 10 个字符',
              trigger: 'blur'
            }
          ]
        }
      }
    },
    methods: {
      // 重置登录表单数据
      reset() {
        this.$refs.loginFormRef.validate(valid => {
          // 重置表单数据
          this.$refs.loginFormRef.resetFields()
        })
      },
      // 点击登录按钮
      login() {
        // 验证表单数据是否合法
        this.$refs.loginFormRef.validate(async valid => {
          // console.log(valid)
          if (!valid) return this.$message.error('用户名或者登录密码不合法')
          // 向服务器发送登录请求
          const {
            data: res
          } = await this.$http.post('login', this.loginForm)
          // console.log(res)
          // 判断是否登录成功
          if (res.meta.status !== 200) {
            return this.$message.error('登录失败')
          }
          // 登录成功获取token，进行会话级存储
          window.sessionStorage.setItem('token', res.data.token)
          // 编程式导航跳转到home组件
          this.$router.push('/home')
        })
      }
    }
  }

</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;

    .login_box {
      background-color: #fff;
      width: 400px;
      height: 350px;
      border-radius: 10px;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);

      .avatar_box {
        width: 140px;
        height: 140px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background: #fff;

        img {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          background-color: #eee;
        }
      }

      .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 10px;
        box-sizing: border-box;

        .btns {
          display: flex;
          justify-content: flex-end;
        }
      }
    }
  }

</style>
